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Sony FE 85mm f/1.8 — Prime/Zoom
Sony

Sony FE 85mm f/1.8

Prime/Zoom

86
/ 100
From $598
VS
Sony FE 85mm f/1.8 wins by 1
Tamron 20-40mm f/2.8 Di III VXD — Prime/zoom
Tamron

Tamron 20-40mm f/2.8 Di III VXD

Prime/zoom

85
/ 100
From $699
Specdex verdict

Sony FE 85mm f/1.8 takes it — here’s why.

In our weighted Specdex score, Sony FE 85mm f/1.8 lands at 86 and Tamron 20-40mm f/2.8 Di III VXD at 85. That puts Sony FE 85mm f/1.8 ahead by 1 points — a narrow margin driven mostly by its strengths in the categories below.

Pick Sony FE 85mm f/1.8 if…

  • ✓Fast aperture
  • ✓Quiet autofocus
  • ✓Weather-sealed (most)

Pick Tamron 20-40mm f/2.8 Di III VXD if…

  • ✓Proven optical formula
  • ✓Weather-sealing (L/GM/S)
  • ✓Strong resale
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Winner by scenario

Derived from the sub-score breakdown · not a separate test

Build

Tamron 20-40mm f/2.8 Di III VXD

Compared on the build sub-score

Tamron 20-40mm f/2.8 Di III VXD leads on build (90 vs 88).

Sharpness

Tie

Compared on the sharpness sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Autofocus

Sony FE 85mm f/1.8

Compared on the autofocus sub-score

Sony FE 85mm f/1.8 leads on af (84 vs 81).

Value for money

Sony FE 85mm f/1.8

Specdex score per dollar at MSRP

Sony FE 85mm f/1.8 more score per dollar ($598 vs $699).

Sony FE 85mm f/1.8 86
vs
85 Tamron 20-40mm f/2.8 Di III VXD

Score breakdown

Sony FE 85mm f/1.8
86
sharpness 86
af 84
build 88
value 85
Tamron 20-40mm f/2.8 Di III VXD
85
sharpness 85
af 81
build 90
value 86

Specs side-by-side

Sony FE 85mm f/1.8 versus Tamron 20-40mm f/2.8 Di III VXD — full spec comparison
Spec Sony FE 85mm f/1.8 Tamron 20-40mm f/2.8 Di III VXD

Sony FE 85mm f/1.8

Pros
  • +Fast aperture
  • +Quiet autofocus
  • +Weather-sealed (most)
Cons
  • −Mount-specific
  • −Weight varies
  • −Price scales with quality

Tamron 20-40mm f/2.8 Di III VXD

Pros
  • +Proven optical formula
  • +Weather-sealing (L/GM/S)
  • +Strong resale
Cons
  • −Mount-specific
  • −Older AF motor on some
  • −Heavier than modern counterparts

FAQ: Sony FE 85mm f/1.8 vs Tamron 20-40mm f/2.8 Di III VXD

Which is better, Sony FE 85mm f/1.8 or Tamron 20-40mm f/2.8 Di III VXD? +

Sony FE 85mm f/1.8 scores 86 on our weighted rubric — ahead by 1. Your best pick depends on the sub-scores above.

Is Sony FE 85mm f/1.8 worth the price? +

At $598, Sony FE 85mm f/1.8 delivers a Specdex score of 86 — strongest in build.

Is Tamron 20-40mm f/2.8 Di III VXD worth the price? +

At $699, Tamron 20-40mm f/2.8 Di III VXD delivers a Specdex score of 85 — strongest in build.

Does Sony FE 85mm f/1.8 or Tamron 20-40mm f/2.8 Di III VXD last longer? +

Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.

Which is better for build, Sony FE 85mm f/1.8 or Tamron 20-40mm f/2.8 Di III VXD? +

Tamron 20-40mm f/2.8 Di III VXD — leads on build (90 vs 88). Compared on the build sub-score.

Which is better for autofocus, Sony FE 85mm f/1.8 or Tamron 20-40mm f/2.8 Di III VXD? +

Sony FE 85mm f/1.8 — leads on af (84 vs 81). Compared on the autofocus sub-score.